Blue Planet 2 has been captivating millions of viewers on Sunday nights.

The BBC documentary has gone to great lengths to give a glimpse into the underwater world.

You can see this above as the film crew’s submarine is attacked by giant sharks.

At more than 20ft long, they were found feasting on a whale carcass at depths of 750m.

But believing the submarine was there to steal their meal, the sixgill sharks try to smash through its glass screen.

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The craft was designed to handle the crushing pressure of the ocean depths, but its crew can be heard becoming increasingly anxious as the predators crash into them.

Will Ridgeon, assistant producer on the show, said: “It was a very unnerving place to be.

“The sub is very sturdy, but you can’t help wonder what damage these powerful sharks are inflicting – even the experienced pilot Joachim admitted he was a little afraid!

“The sharks quickly realised the sub was not competition and their attention returned to the carcass and camerawoman Kirsten was able to film the first deep-sea, sixgill shark feeding frenzy ever witnessed.”